Abstract
The dependence of serious sport injuries on weather influences was checked during 1965 till 1969. During this period 697 serious skiing accidents were put in relation to so called ''weather-phases'' (WPH), which summarize similar weather characteristics in groups. All results were checked statistically. So called biologically favourable WPH showed a significant decrease and biologically unfavourable WPH an increase in the number of accidents. An on-coming low-pressure area presented a particularly serious influence. Practical advice to diminish accident risks is given.